Ectodomain Cleavage of the EGF Ligands HB-EGF, Neuregulin1-beta, and TGF-alpha is Specifically Triggered by Different Stimuli and Involves Different PKC Isoenzymes

Overview

Journal FASEB J

Specialties Biology
Physiology

Date 2008 Sep 2

PMID 18757500

Citations 20

Authors

Andreas Herrlich

Eva Klinman

Jonathan Fu

Cameron Sadegh

Harvey Lodish

Affiliations

Soon will be listed here.

Abstract

Metalloproteinase cleavage of transmembrane proteins (ectodomain cleavage), including the epidermal growth factor (EGF) ligands heparin-binding EGF-like growth factor (HB-EGF), neuregulin (NRG), and transforming growth factor-alpha (TGF-alpha), is important in many cellular signaling pathways and is disregulated in many diseases. It is largely unknown how physiological stimuli of ectodomain cleavage--hypertonic stress, phorbol ester, or activation of G-protein-coupled receptors [e.g., by lysophosphatidic acid (LPA)]--are molecularly connected to metalloproteinase activation. To study this question, we developed a fluorescence-activated cell sorting (FACS)- based assay that measures cleavage of EGF ligands in single living cells. EGF ligands expressed in mouse lung epithelial cells are differentially and specifically cleaved depending on the stimulus. Inhibition of protein kinase C (PKC) isoenzymes or metalloproteinase inhibition by batimastat (BB94) showed that different regulatory signals are used by different stimuli and EGF substrates, suggesting differential effects that act on the substrate, the metalloproteinase, or both. For example, hypertonic stress led to strong cleavage of HB-EGF and NRG but only moderate cleavage of TGF-alpha. HB-EGF, NRG, and TGF-alpha cleavage was not dependent on PKC, and only HB-EGF and NRG cleavage were inhibited by BB94. In contrast, phorbol 12-myristate-13-acetate (TPA) -induced cleavage of HB-EGF, NRG, and TGF-alpha was dependent on PKC and sensitive to BB94 inhibition. LPA led to significant cleavage of only NRG and TGF-alpha and was inhibited by BB94; only LPA-induced NRG cleavage required PKC. Surprisingly, specific inhibition of atypical PKCs zeta and iota [not activated by diacylglycerol (DAG) and calcium] significantly enhanced TPA-induced NRG cleavage. Employed in a high-throughput cloning strategy, our cleavage assay should allow the identification of candidate proteins involved in signal transduction of different extracellular stimuli into ectodomain cleavage.

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Distinct Intracellular Domain Substrate Modifications Selectively Regulate Ectodomain Cleavage of NRG1 or CD44.

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